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Re^2: Performance Trap - Opening/Closing Files Inside a Loop

by tachyon (Chancellor)
on Dec 10, 2004 at 08:30 UTC ( #413781=note: print w/replies, xml ) Need Help??


in reply to Re: Performance Trap - Opening/Closing Files Inside a Loop
in thread Performance Trap - Opening/Closing Files Inside a Loop

We found that ext3 with the 2.4.x Linux Kernel was reasonably happy with 10,000 files in a directory but obviously unhappy with 1 million. By reasonably happy I mean other bottlenecks dominated affairs. I would be interested if anyone has done a study on the relation of file numbers per dir vs access time for different file systems that it a little more precise.

cheers

tachyon

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Re^3: Performance Trap - Opening/Closing Files Inside a Loop
by meredith (Friar) on Dec 10, 2004 at 21:31 UTC

    Out of curiousity, did you test with the 'dir_index' feature flag set? It allows the filesystem to use hashed b-trees for lookups in large directories.

    mhoward - at - hattmoward.org

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[erix]: hippo I think the 26 downvotes sick
[erix]: eh, 29 downvotes
[erix]: but I guess there's no stopping the herd
[1nickt]: Thank you haukex and hippo. I'm thinking of using IPC::System:: Simple::capture instead. But will go reread Hauke's treatise first :-)
[1nickt]: herveus is so weird. Love his reply in that SQLite thread! Much more effective warning system to have diverse monks debunk on technical merits...
[haukex]: IPC::System:: Simple does all the $? handling for you, and does it well
[erix]: weird problem btw (that SQLite question) - I asked astroboy to let us know if he finds the cause
[hippo]: The syntax is warning enough to me.

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